MIC2591B
Micrel
Typical Characteristics (cont.)
Overcurrent Delay Scaling
Factor vs. Temperature
DISCHARGE RESISTANCE (Ω)
5.6
5.4
SCALING FACTOR
5.2
5.0
4.8
4.6
1000
900
800
700
600
500
400
300
200
100
0
0
Discharge Resistance
vs. Temperature
3VOUT
400
350
300
R
DS(ON)
(Ω)
70
250
200
150
100
50
0
0
V
AUX
On-Resistance
(R
DS(ON)
) vs. Temperature
VAUX
12VOUT
4.4
0
10
20 30 40 50 60
0 5
TEMPERATURE (°C)
70
10
20 30 40 50 60
0 5
TEMPERATURE (°C)
10
20 30 40 50 60
0 5
TEMPERATURE (°C)
70
Test Circuit
R
12VSENSEA
0.025Ω
C
IN2
220µF
+3.3V
C
IN1
220µF
0.1µF
R
3VSENSEA
0.010Ω
M1
Si4410DY
C
3VGATE
22nF
3VINA 3VSENSEA
VSTBYA
AUXENA
ONA
/FAULTA
CFILTERA
GND
MIC2591B
R5
15Ω
C
GS
10nF
M2
Si4435BDY
R6
15Ω
C
MILLER
22nF
C
LOAD2
100µF
+3.3V
OUTA
0.1µF
12VINA 12VSENSEA
12VGATEA
12VOUTA
3VOUTA
VAUXA
/PWRGDA
+3.3AUXA
C
LOAD1
100µF
+12V
+12V
OUTA
3VGATEA
0.1µF
SIGNALS
UNDER
SOFTWARE
CONTROL
R1
10k
R2
10k
C
FILTER
0.047µF
R3
10k
VSTBY
R4
10k
C
LOAD3
1µF
(Additional pins omitted for clarity - Slot A shown only)
MIC2591B Test Circuit
March 2005
13
M9999-033105
MICREL [ MICREL SEMICONDUCTOR ]
